Serin Not Recognizing Qualifier From Another PIC

[richard]

you misunderstand how the qualifier works

this can not work as you set the qualifier to 0x0d as per my example , ProgIDRx will always be 0x0d
untill you change it , serin will never change it

if ProgIDRx = $A then ' Match Programmer ID ;;// will always fail

this time out loop is pointless in this example as serin with [a qualifier ] will always block until the input qualifier is received
Serin PrgIn,1,5000,MainLoop,[ProgIDRx],IDByteRx ' Check for new I.D.


this will do the same thing
MainLoop:
Serin PrgIn,1,[ProgIDRx],IDByteRx ' Check for new I.D.
IDByte = IDByteRx
Write 1, IDByte
Z1Alarm = 1 : Z2Alarm = 1 ' Confirm programing Subroutine
pause 500
Z1Alarm = 0 : Z2Alarm = 0
pause 1000
Z1Alarm = 1 : Z2Alarm = 1 'Confirm in programing mode
pause 1000
Z1Alarm = 0 : Z2Alarm = 0
endif
;;;;;;;;;;;;;;;;;;;;;;;;;;;;; START ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
goto MainLoop

I added your modifications and still couldn't get it to work.

note i used 0x0d AS a qualifier as its easer to use than 0x0a in proteus simulator
u need to either change it back to 0x0a or alter the tx code to match

BTW, why the GPIO=0? Does that clear all GPIO ports, I presume

yes because at power up the alarm leds could be in any random state if you don't